Phase controllable synthesis of NaMgF3:Yb3+, Er3+ nanocrystals with effective red upconversion luminescence

Wang, Jue; Zhang, Jing; Xie, Jinhui; Li, Yaoyao; Wang, Lixi; Zhang, Qitu

doi:10.1007/s10854-018-9946-7

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…Usually, the quenching temperature for Yb 2+ emission is low but in NaMgF 3 , quenching is observed even at room temperature. The luminescence of trivalent rare earths such as Ce 3+ , [ 21 ] Pr 3+ , [ 22,23 ] Yb 3+ , Er 3+ , [ 24,25 ] Gd 3+ , [ 26 ] Eu 3+ , [ 27 ] Sm 3+ , [ 28 ] Dy 3+[ 29 ] has also been reported. NaMgF 3 :Yb 3+ , Er 3+ are good candidate host materials for red upconversion luminescence.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

Singh¹,

Belsare²,

Moharil

2021

Luminescence

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NaMgF3‐based phosphors have been described frequently in the literature. Their synthesis faces difficulties typical of fluoride materials. A simple precipitation synthesis for NaMgF3‐based phosphors is described in this paper. This consisted of mixing aq. NaF and MgCl2/MgSO4 solutions. Various activators could be incorporated by adding the required salts during this process. Characteristic emission of the activators was observed in the prepared phosphors. As‐prepared samples exhibited predominantly trivalent lanthanide emission. After thermal treatment in a reductive atmosphere, europium‐doped samples showed the intense emission of Eu2+. By virtue of the intense nature of the emission, lifetime measurements could be made for this sample. Notably, intense thermoluminescence and optically stimulated luminescence were observed in NaMgF3:Eu. A simple, fast method for the synthesis of NaMgF3 was therefore developed.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

Singh¹,

Belsare²,

Moharil

2021

Luminescence

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“…Various nanostructures have been synthesised via the hydrothermal method, including silver nanoparticles on graphene [79], BaTiO3 [80,81], and metal oxide nanoparticles [82][83][84][85]. Regarding NaMgF3 material, Wang et al synthesised (Yb:Er)-doped NaMgF3 nanocrystals, which displayed red upconversion luminescence and reported a synthesis scheme showing the effect of reaction parameters (dopant concentration, reaction temperature and time) on the nanoparticle morphology [86]. Other researchers have reported on NaMgF3 nanoparticles, and NaMgF3:Tb 3+ @NaMgF3 core-shell structures have also been reported [87][88][89].…”

Section: Fabrication Of Nanomaterialsmentioning

confidence: 99%

“…Other researchers have reported on NaMgF3 nanoparticles, and NaMgF3:Tb 3+ @NaMgF3 core-shell structures have also been reported [87][88][89]. The hydrothermal synthesis technique adapted from the literature [86] was used to synthesise some of the nanoparticle samples studied in this thesis.…”

Section: Fabrication Of Nanomaterialsmentioning

confidence: 99%

“…A hydrothermal technique adapted from the literature [86] was followed to synthesise undoped NaMgF3 nanoparticles. 12.5 mmol of NaOH was dissolved in 5 mL of Milli-Q water in a Schott bottle and subsequently mixed with 10 mL of OA and 25 mL of absolute ethanol at room temperature to form a viscous solution A.…”

Section: Namgf3 Nanoparticles Synthesismentioning

confidence: 99%

“…However, cation trace ions shown in Table 4.3 were reported in MgCl2⋅6H2O (Bioxtra, M2670-500G) by the Sigma Aldrich website. It is speculated that some of the trace ions (Ba, Ca, Cu, Fe, Mn or Pb) were incorporated singly or as aggregates into the undoped HS-010 nanoparticles during synthesis creating defects that resulted in the luminescent features (the triplet) observed in transformation of NaMgF3 to NaYbF4 with an increase in temperature and time [86].…”

Section: Reference Pattern a (%) B (%) C (%)mentioning

confidence: 99%

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The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

Nalumaga¹

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NaMgF3 is a host material that has demonstrated luminescent properties suitable for radiation dose measurements when doped with lanthanide (Ln) ions. NaMgF3 has a response to ionising radiation similar to that of tissue, and hence it has potential application in radiotherapy where a high level of accuracy is required. This thesis focused on investigations into the suitability of NaMgF3 nanoparticles for radiation dose measurements. Nanoparticles display advantages that can be exploited to increase spatial resolution in two-dimensional dosimetry. Additionally, nanoparticles exhibit new and different distributions of optically active traps, and their luminescence can be sensitised to increase the signal to noise. Hence, this thesis presents results obtained from the synthesis and characterisation of Ln-doped NaMgF3 nanoparticles. The nanoparticles were synthesised via the hydrothermal, reverse micelle and thermolysis techniques. Structural studies were carried out, followed by investigations on the effect of X-ray irradiation on the luminescent properties of the nanoparticles. It was observed that compared to the bulk materials, the nanoparticles exhibited increased oxygen (O2-)-related defect luminescence and favoured substitution of trivalent ions over the divalent ions. The behaviour was attributed to the stability of trivalent ions in aqueous solutions during nanoparticle synthesis, which encouraged increased incorporation of O2--related defects to create charge neutrality. O2--related defects allowed for O2- → Yb3+ charge transfer process, hence Yb3+ emission in the infrared region. X-ray stimulation resulted in Yb3+ → Yb2+ radiophotoluminescence (RPL), but the increase in Yb-dopant concentration revealed no significant effect on the structural and luminescent properties. Most of the studied materials exhibited multiple luminescence properties for monitoring radiation doses, which would increase the dose accuracy. Ce-doped nanoparticles exhibited the first reported optically stimulated luminescence (OSL) in Ln-doped near tissue-equivalent NaMgF3 nanoparticles suitable for total radiation measurements. OSL occurred through a series of processes, including the creation of F-centres through X-ray irradiation and optical stimulation to release electrons that recombined with holes trapped at Ce4+ sites, followed by Ce3+ emission. In addition, the Ce3+ → Ce4+ RPL effect suitable for cumulative radiation monitoring was observed from isolated and aggregated Ce3+ sites in the Ce-doped nanoparticles, providing an additional method to increase dose accuracy. Furthermore, the Ce,Sm co-doped NaMgF3 nanoparticles demonstrated suitability for real-time and cumulative radiation dose monitoring via Sm radioluminescence after a priming dose and multiple Ce3+ → Ce4+, Sm3+ → Sm2+, and O2- → O- RPL signals through which cumulative radiation doses can be determined. Finally, the applicability of singly doped oleic acid-capped NaMgF3:Eu and NaMgF3:Sm nanoparticles for radiation monitoring via the Eu3+ → Eu2+ and Sm3+ → Sm2+ RPL effects were demonstrated. The studies were followed by investigations of the sensitisation of Eu3+ and Sm3+ luminescence signals using 2-thenoyltrifluoroacetone (TTFA). The first successful sensitisation of NaMgF3 nanoparticles was demonstrated through remarkable TTFA → Eu3+ energy transfer. However, minimal TTFA → Sm3+ sensitisation was observed, attributable to a non-optimal energy difference between the TTFA triplet state and the Sm3+ resonance energy level, encouraging back energy transfer. TTFA → O2- sensitisation was additionally observed in the NaMgF3:Sm nanoparticles. Furthermore, enhancement of Sm3+ luminescence was additionally demonstrated in the Ce,Sm co-doped nanoparticles via energy transfer from the Ce3+ fully allowed 4f → 5d transitions. The studies resulted in a wealth of information, and where possible, detailed schematic models are presented to explain the observations, which will guide future research. Ultimately, nanoparticles display luminescent properties suitable for dosimetry applications, and the results encouraged further research into the application of nanoparticles as dosimeter materials.

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Enhancement of upconversion luminescence intensity in NaMgF3:2.5%Yb3+, 0.5%Er3+ nanocrystals with Eu3+ doping

Zhang

Wang

Xie

et al. 2021

J Mater Sci: Mater Electron

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Phase controllable synthesis of NaMgF3:Yb3+, Er3+ nanocrystals with effective red upconversion luminescence

Cited by 9 publications

References 38 publications

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

Enhancement of upconversion luminescence intensity in NaMgF3:2.5%Yb3+, 0.5%Er3+ nanocrystals with Eu3+ doping

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Phase controllable synthesis of NaMgF3:Yb3+, Er3+ nanocrystals with effective red upconversion luminescence

Cited by 9 publications

References 38 publications

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF3

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF3

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

Enhancement of upconversion luminescence intensity in NaMgF3:2.5%Yb3+, 0.5%Er3+ nanocrystals with Eu3+ doping

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Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃